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Related Experiment Video

Updated: Feb 28, 2026

High Throughput Microfluidic Rapid and Low Cost Prototyping Packaging Methods
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A High-Accuracy Solid/Liquid Composite Packaging Method for Implantable Pressure Sensors.

Bo Wang1,2,3,4, Yubiao Zhang2,3,4, Yuning Huang2,3,4

  • 1School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China.

Micromachines
|February 27, 2026
PubMed
Summary

This study introduces a novel Parylene-C and silicone oil packaging for implantable pressure sensors, enhancing accuracy and stability. The composite layer effectively reduces mechanical coupling and water ingress for reliable long-term performance.

Keywords:
MEMSParylene-Ccomposite packaging structurepressure sensorsilicone oil

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Implantable pressure sensors require robust packaging for accurate measurements and environmental stability.
  • Mechanical coupling and water molecule infiltration degrade sensor performance over time.

Purpose of the Study:

  • To develop and validate a solid/liquid composite packaging technique for implantable pressure sensors.
  • To improve measurement accuracy and long-term environmental stability of these sensors.

Main Methods:

  • A composite packaging technique using Parylene-C and silicone oil was proposed.
  • Finite element simulation analyzed the packaging's effect on sensor mechanics.
  • Experimental validation assessed sensor accuracy and stability in simulated bodily fluids.

Main Results:

  • The solid/liquid composite packaging decoupled interface shear forces, reducing mechanical coupling errors.
  • Silicone oil's hydrophobic and defect-filling properties slowed water infiltration, enhancing stability.
  • Sensor accuracy improved to 0.5 mmHg, with drift below 2 mmHg over 30 days in simulated bodily fluids.

Conclusions:

  • The proposed Parylene-C and silicone oil composite packaging offers a feasible solution for high-performance implantable pressure sensors.
  • This method significantly enhances both the accuracy and long-term stability of implantable pressure sensors.
  • The technique addresses critical packaging challenges for reliable in-vivo pressure monitoring.